/* ===================

AX2E (AXESCON XACML 2.0 Engine) is the Java authorization engine, which implements OASIS XACML 2.0 standard.
Copyright (C) 2007 AXESCON LLC

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA


Contact: AXESCON LLC - info{at}axescon.com

 =================== */
package axescon.xacml.engine.fn;

import axescon.xacml.model.policy.AttributeValue;
import axescon.xacml.model.shared.attr.ArithmeticValue;
import axescon.xacml.api.*;

/**
 * @author Date: Sep 28, 2005
 *         Responsibilities: implements arithmetic add,
 * see axescon.xacml 2.0 spec ch. A.3.2 Arithmetic functions
 */
public class FnArithmeticAdd extends AbstractFn {

    public int getArgTypeListLength() {
        return 1;
    }

    public int getMinArgListLength() {
        return 2;
    }

    public int getMaxArgListLength() {
        return -1;
    }

    public Liquid exec(Liquid[] args) throws XacmlException,
            FunctionEvalIndeterminateException {

        ArithmeticValue arg0 =   (ArithmeticValue)args[0].getSingularUnsafe();
        ArithmeticValue ret=(arg0).getZero().add(arg0);
        //todo this may be a better solution        ArithmeticValue ret=args[0][0].clone();

        for(int i=1;i<args.length;i++){
            ret.add((ArithmeticValue)args[i].getSingularUnsafe());
        }

        return new Liquid((AttributeValue)ret);
   }


}
